English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Advancement of technologies relies on discovery of new materials withemerging physical properties that are determined by their crystal structures.Ruddlesden-Popper (R-P) phases with formula of $A_{n+1}$$B_n$$X_{3n+1}$(n=1,2,3...) are among one of the most widely studied class of materials due totheir electrical, optical, magnetic, thermal properties and their combinedmultifunctional properties(Ref.1-6). In R-P phases, intergrowth is well-knownin the short range(Ref.7-9); however, no existing compounds have been reportedto have different n mixed in bulk single crystals. Here we design a hybrid R-Pnickelate $La_2NiO_4$$La_3Ni_2O_7$ by alternatively stacking bilayers, which isthe active structural motif in the newly discovery high-$T_c$ superconductor$La_3Ni_2O_7$ and single layers of the antiferromagnetic insulator $La_2NiO_4$.We report the successful synthesis of $La_2NiO_4$$La_3Ni_2O_7$ single crystals,and X-ray diffraction and real-space imaging vis STEM show that the crystalstructure consists of single layers and bilayers of $NiO_6$ octahedral stackingalternatively perpendicular to the ab plane, characterized by the orthorhombicImmm (No.71) space group. Resistivity measurements indicate a peculiarinsulator-to-metal transition around 140 K on cooling. Correlated densityfunctional theory calculations corroborate this finding, and reveal that thesingle layer becomes paramagnetic metallic due to charge transfer via LaOlayers. The discovery of $La_2NiO_4$$La_3Ni_2O_7$ opens a door to access acompletely new family of 3D hybrid R-P phases with the formula of$A_{n+1}$$B_n$$X_{3n+1}$$A'_{m+1}$$B'_m$$X'_{3m+1}$ which potentially host aplethora of emerging physical properties for various applications.

Design and synthesis of three-dimensional hybrid Ruddlesden-Popper nickelate single crystals